Release 20170419 Summary of changes: CLOCK: An updated NuSTAR clock correction file, version 70, is available. This file is up to date through 2017-04-19 The clock file is available from the SOC public website: http://www.srl.caltech.edu/NuSTAR_Public/NuSTAROperationSite/clockfile.php IMPORTANT NOTE - The versions of clock correction files v022 to v063 were found to have unphysical discontinuities in the clock correction. Only versions v066 and later should be used in analysis.